Ancient Monuments

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Offa's Dyke: Section north & south of Plas-Offa

A Scheduled Monument in Chirk (Y Waun), Wrexham (Wrecsam)

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Latitude: 52.9576 / 52°57'27"N

Longitude: -3.0712 / 3°4'16"W

OS Eastings: 328135

OS Northings: 340565

OS Grid: SJ281405

Mapcode National: GBR 72.KQGZ

Mapcode Global: WH785.SXPH

Entry Name: Offa's Dyke: Section N & S of Plas-Offa

Scheduled Date: 23 July 1930

Source: Cadw

Source ID: 2950

Cadw Legacy ID: DE138

Schedule Class: Monument

Category: Linear earthwork

Period: Early Medieval

County: Wrexham (Wrecsam)

Community: Chirk (Y Waun)

Traditional County: Denbighshire


The monument consists of the remains of a length of Offa’s Dyke, a presumed 8th century AD defensive bank and ditch. It consists of a stretch of bank, with a ditch on the western side. A counterscarp (raised bank) may be visible on the west side of the ditch in places.

The monument is of national importance for its potential to enhance our knowledge of early medieval defensive organisation and settlement. It retains significant archaeological potential, with a strong probability of the presence of associated archaeological features and deposits. A dyke may be part of a larger cluster of monuments and their importance can be further enhanced by their group value.

The scheduled area comprises the remains described and the areas around them within which related evidence may be expected to survive. The majority of the scheduled area is up to c.40m wide, forming a linear strip enclosing the bank and ditch.

Source: Cadw

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